GD&T Cylindricity Definition

In GD&T, cylindricity tolerance is used when cylindrical part features must have good circularity and straightness, like pins or camshafts.  While circularity applies only to cross sections, cylindricity applies simultaneously to the entire surface.  Since cylindricity is applied to an individual surface, this tolerance does not need to be related to a datum.

An example of cylindricity tolerance is shown below.  In the top figure, a shaft has a cylindricity tolerance applied to it.  The boxed symbols can be read "this surface must lie between two concentric cylinders spaced 0.2 apart".  The lower figure shows a sample part that meets this tolerance.  Note that this tolerance requires verification in all three dimensions.  Because cylindricity refines the form of a surface, it is treated like flatness in order to perform a tolerance stack.

Cylindricity

Download CAD Software

Video Tutorial


"I must tell you that after almost 20 years of computerized CAD work, your software offers the simplest interface I have ever seen. With minimal practice you can create just about any part needed. I also found your web forum to be extremely helpful when I had a question that I could not solve on my own. Your knowledgeable techs were quick to give ..."
- Chris Cardinal
PCB CAD program

Design printed circuit boards online at our PCB division - Pad2Pad.com

Visa Mastercard Amex Discover
eMachineShop.com | 31 Industrial Ave. | Mahwah, NJ 07430 | Phone 201-962-7511 | Questions? Contact us.

Mobile version

© 2015 eMachineShop.com | Admin | Site by Paradigm Site Ensemble CMS Copyright © 2015 Paradigm New Media, LLC. All rights reserved.